Grizzly sells a really nice bench with lots of drawer space. I already had two of these benches in the garage and rather than buy or build a cabinetmakers workbench I decided to improve the bench I had, and then use it until my woodworking projects outgrew it.
The first thing I wanted was a plane stop. The stop is basically a board that sticks up proud of the table surface by an adjustable amount. Here you can see a profile of the stop.
The stop attaches to the end of the bench by two bolts. I milled slots in the stop board to allow it to slide up and down. The board is held in place by friction and adjusted by a quick light taps with a hammer. I have some ideas for a screw lock for the stop, but figured I would use the friction adjustment first and it seems to work great.
Below you can see the stop in use. A board rest against the stop so the length of the board can be planed right out over the edge of the board. This is useful for thicknessing stock by hand.